Changing the failure for Computed_field_evaluate_cache_at_location to call Computed_field_clear_cache resulted in a massive speed regression for example a/resample_texture, so I have put this back to clearing only it's own cache again.
Changing the failure for Computed_field_evaluate_cache_at_location to call Computed_field_clear_cache resulted in a massive speed regression for example a/resample_texture, so I have put this back to clearing only it's own cache again.

git-svn-id: 4705079bc6b8aadf675e3696f5c015a6aa4916e3@5416 3c1deb5b-d424-0410-962d-aba41a686d42

OpenCMISS/zinc,hsorby/zinc,OpenCMISS/zinc,OpenCMISS/zinc,hsorby/zinc,hsorby/zinc,hsorby/zinc,OpenCMISS/zinc